The article empirically estimates the effects of disability pensions provided under the Canada / Quebec Pension Plans on the labor-force participation rates of males aged 45-64 years. Two data sets are used. One consists of pooled cross section / annual time-series data by province for the years 1975-83. The other consists of observations as of 1985 on 651 males in the specified age group. Naive estimation results from both sets of data suggest a large negative effect of pension income. In the case of the micro data, this effect becomes small and statistically nonsignificant when more sophisticated estimation methods are used.

This article analyzes an important aspect of the contemporary reorganization of work within firms: the shift from “Tayloristic” organization (characterized by specialization by tasks) to “holistic” organization (featuring job rotation, integration of tasks, and learning across tasks). We examine four driving forces behind this restructuring process: advances in production technologies promoting technological task complementarities, advances in information technologies promoting informational task complementarities, changes in worker preferences in favor of versatile work, and advances in human capital that make workers more versatile. Our analysis also helps explain the recent widening of wage differentials and disparities in job opportunities within narrowly defined groups.

The paper analyzes an important aspect of the contemporary reorganization of work within firms: the shift from “Tayloristic” organization (characterized by specialization by tasks) to “holistic” organization (featuring job rotation, integration of tasks and learning across tasks). We examine four driving forces behind this restructuring process: advances in production technologies promoting technological task complementarities, advances in information technologies promoting informational task complementarities, changes in worker preferences in favor of versatile work, and advances in human capital that make workers more versatile. Our analysis can also help explain the recent widening of wage differentials and disparities in job opportunities, not only between occupational, educational, and industry groups, but also within these groups. We are indebted to Michael Orszag for his insightful comments, and have benefited from the suggestions of Ruth Klinov, Reuben Gronau, Eric Mellander, Torsten Persson, Jorgen Weibull, and seminar participants at the Hebrew University of Jerusalem, the Industrial Institute for Economic and Social Research (Stockholm), the Institute for International Economic Studies (Stockholm), and an anonymous referee. We have profited from discussions with Solveig Wikstrom on the reorganization of firms, and are grateful to Jorgen Nilsson for drawing the figures. MULTI-TASK LEARNING AND THE REORGANIZATION OF WORK 1

We study the effectiveness of magnet programs in an urban district that ration excess demand by admission lotteries. Differential attrition arises since students who lose the lottery are more likely to pursue options outside the school district than students who win the lottery. When students leave the district, important outcome variables are often not observed. The treatment effects are not point-identified. We exploit known quantiles of the outcome distribution to construct informative bounds on treatment effects. We find that magnet programs improve behavioral outcomes but have no significant effect on achievement.